How To Disable DNS Recursion On Your Dedicated Server

Recursive DNS queries occur when information is requested from a DNS server that does not "own" a domain to query subsequent DNS servers until DNS information is found an answer is returned.

Servers with recursive DNS queries enabled are vulnerable to fake requests that can flood the server with the results of each query, overwhelming the server with a volume of traffic too large to be processed, causing performance degradation. This is know as a DOS/DDOS (Denial of Service/Distributed Denial of Service) Attack.